391149 has 20 divisors (see below), whose sum is σ = 638880. Its totient is φ = 236520.

The previous prime is 391133. The next prime is 391151. The reversal of 391149 is 941193.

It is not a de Polignac number, because 391149 - 2⁴ = 391133 is a prime.

It is a super-4 number, since 4×391149⁴ (a number of 23 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 9.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 391149.

It is not an unprimeable number, because it can be changed into a prime (391159) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 672 + ... + 1110.

It is an arithmetic number, because the mean of its divisors is an integer number (31944).

2³⁹¹¹⁴⁹ is an apocalyptic number.

It is an amenable number.

391149 is a deficient number, since it is larger than the sum of its proper divisors (247731).

391149 is a wasteful number, since it uses less digits than its factorization.

391149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462 (or 453 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 391149 is about 625.4190595113. The cubic root of 391149 is about 73.1331154701.

The spelling of 391149 in words is "three hundred ninety-one thousand, one hundred forty-nine".